JavaWorld Java book reviews - A collection of all of the book reviews by the editors and writers of JavaWorld - http://www.javaworld.com/news-reviews/jw-nr-book-reviews.html
O'Reilly - Java In A Nutshell - Third edition of the reference book, completely available online. - http://www.unix.org.ua/orelly/java-ent/jnut/
The Java Series - Published on Sun's behalf by Addison-Wesley Longman, this is the authorized series of books on the Java Platform and APIs. - http://www.sun.com/books/java_series.html
FreeTechBooks: Java Programming Language - Annotated list of free online programming books. Topics range from beginner to advanced. Descriptions, publishing information, links. - http://www.freetechbooks.com/viewforum.php?f=4
TechBooksForFree - Java - A collection of Java programming books available on the Web free of charge. - http://www.techbooksforfree.com/java.shtml
TechBookReport - Java - Independent book reviews of Java and Java-related titles. Also includes reviews of Java related software and utilities. - http://www.techbookreport.com/JavaIndex.html
Java Collections - By John Zukowski (Apress). - http://www.apress.com/book/bookDisplay.html?bID=36
Core Java Media Framework - by Linden deCarmo. Book home page with table of contents, reviews, sources, fixes. - http://www.mindspring.com/~lindend/corejmf/
Core Web Programming 2nd Edition - by Marty Hall and Larry Brown. Book home page with sample content and complete archive of Java source code. - http://www.corewebprogramming.com/
Recommended Java and Web-Programming Books - A large number of personal recommendations for the best Java and WWW programming books, sorted by category, from an experienced developer and instructor. - http://www.apl.jhu.edu/~hall/java/Java-Books.html